lib/oelite: improve error message on multiple providers
lib/oelite: improve error message on multiple providers

diorcety/oe-lite-core,hundeboll/core,sknsean/core,sknsean/core,sknsean/core,hundeboll/core,hundeboll/core,hundeboll/core,sknsean/core,sknsean/core,diorcety/oe-lite-core